Diagnostic method and control apparatus for gas sensor

Details Diagnostic method and control apparatus for gas sensor Diagnostic method and control apparatus for gas sensor

2008-02-19

2009-11-10

Huynh, Hai H (Department: 3747)

Internal-combustion engines

Charge forming device

Including exhaust gas condition responsive means

C123S481000, C060S276000, C701S109000

Reexamination Certificate

active

07614392

ABSTRACT:
A gas sensor diagnostic method includes: a fuel supply detecting step of detecting an interruption of a fuel supply to the internal combustion engine, and a restart of the fuel supply after the interruption of the fuel supply; a response time period accumulating step of determining a response time period by accumulating a first time period that the sensor output value reaches from a first threshold value to a second threshold value after the detection of the interruption of the fuel supply, and a second time period that the sensor output value reaches from a third threshold value to a fourth threshold value after the detection of the restart of the fuel supply after the interruption of the fuel supply; and an abnormal state diagnosing section of determining an abnormal state of the gas sensor when the response time period is greater than a predetermined time period.

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